Ever since I signed up with u-Verse service, I have been having constant connection drop out problem. I even wrote a ping script myself to check if I have any connection problem.
Initially it was that long download would freeze for no reason. Everything else seems to be fine except hiccups in YouTube which I blame cache. Then I started streaming video and it is bad. It is impossible to watch a movie using my Blu-ray player. And then, uploading pictures over flickr constantly fails.
And finally, I found the problem! It was my router, running DD-WRT. Compounded by the fact that U-verse is issuing a DHCP lease that is good for just 10 minutes! From what I understand, it means every 10 minutes, all connections on my router go dark.
The simple workaround is to run a firewall script:
iptables -I INPUT -p udp --dport 68 -j ACCEPT
to allow the DHCP packet to go through. Go figure!
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